Most people had no idea who or what Zendesk are, but they should. Zendesk provides customer service portals to companies such as Pinterest, Tumblr and Twitter. Zendesk revealed in their blog that they’ve been hacked.

Pinterest, Tumblr and Twitter have been sending notices to their affected users regarding the security breach.

From Tumblr support:

Important information regarding your security and privacy

For the last 2.5 years, we’ve used a popular service called Zendesk to store, organize, and answer emails to Tumblr Support. We’ve learned that a security breach at Zendesk has affected Tumblr and two other companies. We are sending this notification to all email addresses that we believe may have been affected by this breach.

This has potentially exposed records of subject lines and, in some cases, email addresses of messages sent to Tumblr Support. While much of this information is innocuous, please take some time today to consider the following:

• The subject lines of your emails to Tumblr Support may have included the address of your blog which could potentially allow your blog to be unwillingly associated with your email address.
• Any other information included in the subject lines of emails you’ve sent to Tumblr Support may be exposed. We recommend you review any correspondence you’ve addressed to support@tumblr.com, abuse@tumblr.com, dmca@tumblr.com, legal@tumblr.com, enquiries@tumblr.com, or lawenforcement@tumblr.com.
• Tumblr will never ask you for your password by email. Emails are easy to fake, and you should be suspicious of unexpected emails you receive.

Your safety is our highest priority. We’re working with law enforcement and Zendesk to better understand this attack. Please monitor your email and Tumblr accounts for suspicious behavior, and notify us immediately if you have any concerns.